Introdução de espécies de peixes: o caso da bacia do rio Sorocaba

Abstract

The objective of this study is to report the occurrence of non-native fish species in the Sorocaba river basin, São Paulo state, describing their possible causes of your introductions and the potential consequences that may occur in the community of native fish species in this basin. The section where the work was done and recorded occurrences of the introduced species is located between the cities of Iperó and Cerquilho. The species were captured in Sorocaba, Sarapuí and Tatuí rivers. During the collection periods were recorded the occurrence of 19 species introduced in the Sorocaba river basin. Of these four species are considered native (endemic) in the region of Alto Paraná basin, but did not occur in the basin of the river Sorocaba, five are exotic, eight alochtone and two hybrids. The reasons for the introduction of fish are several, but this practice should be avoided to the maximum, because there is no way to control the populations of fish species, as already introduced in the environment. In the Sorocaba river basin are needed specific studies involving the introduced species, to be able to assess the effects that these new species may be causing the environment and indicate attenuating measures to recurring impacts of such introductions.